Pole structure



F. ENGEL.

POLE STRUCTURE.

APPLICATION FILED DEC. 13, 1915 RENEWED JUNE 9,1920.

Patented Jan. 25, 1921.

me/Mofa Fra/1k Enge/ UNITED Asm'rias PATENT OFFICE.

FRANK ENGEL, F NIAGARA FALLS, NEW' YORK, ASSIGNOR TO U. S. LIGHT & HEAT CORPORATION, OF NIAGARA FALLS, NE'W YORK, A CORPORATION OF NEW YORK.

POLE STRUCTURE.

Specification of Letters Patent.

Patented J an. 25, 1921.

Application filed December 13, 1915, Serial No. 68,553. Renewed .Tune 9, 1920. Serial No. 387,778.

To all whom t may concern:

Be it known that I, FRANK ENGEL, a citizen of the United States,residing at Niagara Falls, in the county of Niagara and State of New York, have invented new and useful improvements in Pole Structures, or which the Jfollowing is a specification.

This invention relates to pole structures,

More particularly the invention relates to improved means and method of mounting same for preventing the sharp edges on the pole pieces of a dynamo-electric machine from cutting through the insulation of the windings. It has been the practice heretofore to tile the edges from the pole pieces, a laborious and therefore expensive operation.

One of the objects of the invention is to provide a pole piece in which danger ot cutting through the insulation is obviated.

Another object is to provide a simple device which may be applied to the core member ot' a pole piece to prevent cutting of the insulation.

Another object is to provide an improved method of applying the windings to the pole pieces. I

These and other objects are attained by this invention, as will appear from the description which follows.

Referring to the accompanying drawings:

Figure 1 is an elevation of a pole piece with a guard and winding.

Fig. 2 is a plan view in section, taken on the line A -A of Fig. 1, the winding` being omitted.

The numeral indicates the laminated core of the ordinary pole piece provided with the pole tips l1. Said laminated core is provided with end plates 12 which, as shown in the drawings, are made narrower than the laminated core, so that the laminated core overlaps the end plates on both sides. The pole piece may be secured to the frame 13 in any suitable way.

Placed between the windings 14 and the pole pieces are the guards 15, which are preferably piecesot' steel, though other material may be used, oi substantially U-shape,

rl'hese guards are placed on opposite sides 0fthe pele piece with the bottom part of the il arranged against'an end plate, as shown in Fig. 2, lt will be understood, of course, that the guards should not overlap to form a conductor around the pole piece, as in that case a heavy current would be induced thereon.

The winding let is mounted on the pole piece as follows. rThe formed coil, with the guards 15 lightly held therein, is placed over the pole piece, which, of course, has been removed from the trame 13. Pressure is applied and the guards slip down over the s larp edges of the lan'iinations and the end plates until guards and winding are in their proper position, close to the pole tips. rThe insulation ot the windings is subjected to no 'rubbing or cutting action, though they are made to iit closely to the pole pieces to prevent shake or distortion during operation ot the dynamo-electric machine.

@ne embodiment of the present invention has been described in detail. Many modifications will occur to those skilled in the art without departing from the spirit ot the invention as defined in the appended claim.

Having described my invention, what l claim as new and desire to secure by Letters Patent ot the United States is .ln combination, a pole piece comprising a laminated core, end plates therefor arranged symmetrically with the laminations oi the core but being narrower than said core, whereby recessed corners are provided, a pair oi' lvl-shaped guards each embracing three sides oi' said pole piece, the middle portion or" eachA or' said guards being parallel and in contact with an end plate, and a winding encircling said pole piece and guards.

In witness whereof, I have hereunto subscribed my name.

FRANK ENGEL. 

